one door vs two door

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  1. S

    Smoke comes out when opening fireplace door

    We have a 2 door BIS 1.2 ZC fireplace. When adding firewood, I usually only open one door. However, if I also open the second door (part way) a lot of smoke (and some ash) escapes into the room. What is causing this to happen? I ask because we are thinking of replacing our unit with a new single...
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